In administering a calcium channel blocker to a patient diagnosed with primary hypertension, the nurse understands this is due to which mechanism of action of this medication?

Blocks formation of angiotensin II, a potent vasoconstrictor

Blocks the action, not the formation, of angiotensin

Relaxes the smooth muscle of the blood vessels.

Decreases blood vessels ability to contract and cause vasoconstriction.

Answer and Explanation

The Correct Answer is C

A.   This is the mechanism of action of angiotensin-converting enzyme (ACE) inhibitors, not calcium channel blockers. ACE inhibitors work by preventing the formation of angiotensin II, a hormone that causes blood vessels to constrict.
B.   Calcium channel blockers do not directly affect angiotensin.
C.   This is the correct mechanism of action of calcium channel blockers. By blocking the influx of calcium ions into smooth muscle cells, these medications cause the blood vessels to relax and dilate, lowering blood pressure.
D.   Calcium channel blockers work by relaxing the smooth muscle of the blood vessels, which decreases their ability to contract and cause vasoconstriction.

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Correct Answer is C

Explanation

A. While yogurt is a nutritious food, it is not a significant source of iron.
B. Oranges are rich in vitamin C, which can help the body absorb iron from other foods. However, they are not a significant source of iron themselves.
C. Red meat, such as beef, lamb, and pork, is an excellent source of heme iron, which is easily absorbed by the body. This makes red meat a highly recommended food for people with iron deficiency.
D. Cashews are a good source of plant-based iron, but they also contain phytates, which can interfere with iron absorption. Therefore, while cashews can contribute to iron intake, they may not be as effective as red meat in addressing iron deficiency.

A. "We will replace the carpet in our bedroom with tile. B. "We'll keep the plants in our home dusted." C. "We're glad the dog can continue to sleep in our bedroom. D. "We'll be sure to use the fireplace often to keep the house warm in the winter."

Correct Answer is A

Explanation

A. This statement indicates a good understanding of environmental control for asthma management. Carpets can trap dust, allergens, and mold, which can trigger asthma attacks. Replacing the carpet with tile can help to reduce exposure to these allergens.
B. While dusting plants can help to reduce exposure to allergens, it is not as effective as removing potential allergens from the environment altogether. Plants themselves can also be sources of allergens, so it might be best to remove them from the home, especially the bedroom.
C. Pets, especially dogs and cats, can be a significant source of allergens for people with asthma. Keeping a pet in the bedroom can increase exposure to allergens and trigger asthma attacks.
D. Burning wood in a fireplace can produce smoke and other pollutants that can irritate the airways and trigger asthma attacks. It is best to avoid using fireplaces, especially during the winter months.

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In administering a calcium channel blocker to a patient diagnosed with primary hypertension, the nurse understands this is due to which mechanism of action of this medication?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is C

Explanation

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Correct Answer is A

Explanation

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